[PATCH 4.9] libstdc++ pretty-printers: Backport Python 3 support from mainline

[Samuel Bronson]

Since Jonathan Wakely independantly committed some of the changes I was
preparing, I had to backport two commits, r210625 and r212453
(git commits 3a30bda and b0a6074).

2014-08-02  Samuel Bronson  <naesten@gmail.com>

	Backport r212453 from trunk
	2014-07-11  Samuel Bronson  <naesten@gmail.com>
		    Matthias Klose  <doko@ubuntu.com>

	PR libstdc++/58962
	* python/libstdcxx/v6/printers.py: Port to Python 2+3
	(imap): New compat function.
	(izip): Likewise.
	(Iterator): New mixin to allow writing iterators in Python 3 style
	regardless of which version we're running on.
	[Python3] (long) New compat alias for "int".
	* testsuite/lib/gdb-test.exp: Port to Python 2+3 (print syntax)

	Backport r210625 from trunk
	2014-05-19  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py: Use Python3 raise syntax.
---
 libstdc++-v3/ChangeLog                       |  20 +++++
 libstdc++-v3/python/libstdcxx/v6/printers.py | 120 ++++++++++++++++++---------
 libstdc++-v3/testsuite/lib/gdb-test.exp      |   4 +-
 3 files changed, 104 insertions(+), 40 deletions(-)

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